From 987f27fbd27fc8a88018882f4071c46b6de4195c Mon Sep 17 00:00:00 2001 From: Eric Rowe Date: Mon, 26 Mar 2012 16:55:30 -0700 Subject: First checkin of cpustats This utility is similar to top but with two major differences. 1) It removes the overhead of gathering process/thread stats. 2) It measures the time spent in each frequency for each sample duration. Bug: 6147843 Change-Id: Ie9073470f8cd1778fe902ea6383bef2311e91cf1 --- cpustats/cpustats.c | 429 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 429 insertions(+) create mode 100644 cpustats/cpustats.c (limited to 'cpustats/cpustats.c') diff --git a/cpustats/cpustats.c b/cpustats/cpustats.c new file mode 100644 index 00000000..d720f5e5 --- /dev/null +++ b/cpustats/cpustats.c @@ -0,0 +1,429 @@ +/* + * Copyright (c) 2012, The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Google, Inc. nor the names of its contributors + * may be used to endorse or promote products derived from this + * software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include +#include +#include + +#define MAX_BUF_SIZE 64 + +struct freq_info { + unsigned freq; + long unsigned time; +}; + +struct cpu_info { + long unsigned utime, ntime, stime, itime, iowtime, irqtime, sirqtime; + struct freq_info *freqs; + int freq_count; +}; + +#define die(...) { fprintf(stderr, __VA_ARGS__); exit(EXIT_FAILURE); } + +static struct cpu_info old_total_cpu, new_total_cpu, *old_cpus, *new_cpus; +static int cpu_count, delay, iterations; +static char minimal, aggregate_freq_stats; + +static int get_cpu_count(); +static int get_cpu_count_from_file(char *filename); +static long unsigned get_cpu_total_time(struct cpu_info *cpu); +static int get_freq_scales_count(int cpu); +static void print_stats(); +static void print_cpu_stats(char *label, struct cpu_info *new_cpu, struct cpu_info *old_cpu, + char print_freq); +static void print_freq_stats(struct cpu_info *new_cpu, struct cpu_info *old_cpu); +static void read_stats(); +static void read_freq_stats(int cpu); +static char should_aggregate_freq_stats(); +static char should_print_freq_stats(); +static void usage(char *cmd); + +int main(int argc, char *argv[]) { + struct cpu_info *tmp_cpus, tmp_total_cpu; + int i, freq_count; + + delay = 3; + iterations = -1; + minimal = 0; + aggregate_freq_stats = 0; + + for (i = 0; i < argc; i++) { + if (!strcmp(argv[i], "-n")) { + if (i + 1 >= argc) { + fprintf(stderr, "Option -n expects an argument.\n"); + usage(argv[0]); + exit(EXIT_FAILURE); + } + iterations = atoi(argv[++i]); + continue; + } + if (!strcmp(argv[i], "-d")) { + if (i + 1 >= argc) { + fprintf(stderr, "Option -d expects an argument.\n"); + usage(argv[0]); + exit(EXIT_FAILURE); + } + delay = atoi(argv[++i]); + continue; + } + if (!strcmp(argv[i], "-m")) { + minimal = 1; + } + if (!strcmp(argv[i], "-h")) { + usage(argv[0]); + exit(EXIT_SUCCESS); + } + } + + cpu_count = get_cpu_count(); + + old_cpus = malloc(sizeof(struct cpu_info) * cpu_count); + if (!old_cpus) die("Could not allocate struct cpu_info\n"); + new_cpus = malloc(sizeof(struct cpu_info) * cpu_count); + if (!new_cpus) die("Could not allocate struct cpu_info\n"); + + for (i = 0; i < cpu_count; i++) { + old_cpus[i].freq_count = new_cpus[i].freq_count = get_freq_scales_count(i); + new_cpus[i].freqs = malloc(sizeof(struct freq_info) * new_cpus[i].freq_count); + if (!new_cpus[i].freqs) die("Could not allocate struct freq_info\n"); + old_cpus[i].freqs = malloc(sizeof(struct freq_info) * old_cpus[i].freq_count); + if (!old_cpus[i].freqs) die("Could not allocate struct freq_info\n"); + } + + // Read stats without aggregating freq stats in the total cpu + read_stats(); + + aggregate_freq_stats = should_aggregate_freq_stats(); + if (aggregate_freq_stats) { + old_total_cpu.freq_count = new_total_cpu.freq_count = new_cpus[0].freq_count; + new_total_cpu.freqs = malloc(sizeof(struct freq_info) * new_total_cpu.freq_count); + if (!new_total_cpu.freqs) die("Could not allocate struct freq_info\n"); + old_total_cpu.freqs = malloc(sizeof(struct freq_info) * old_total_cpu.freq_count); + if (!old_total_cpu.freqs) die("Could not allocate struct freq_info\n"); + + // Read stats again with aggregating freq stats in the total cpu + read_stats(); + } + + while ((iterations == -1) || (iterations-- > 0)) { + // Swap new and old cpu buffers; + tmp_total_cpu = old_total_cpu; + old_total_cpu = new_total_cpu; + new_total_cpu = tmp_total_cpu; + + tmp_cpus = old_cpus; + old_cpus = new_cpus; + new_cpus = tmp_cpus; + + sleep(delay); + read_stats(); + print_stats(); + } + + // Clean up + if (aggregate_freq_stats) { + free(new_total_cpu.freqs); + free(old_total_cpu.freqs); + } + for (i = 0; i < cpu_count; i++) { + free(new_cpus[i].freqs); + free(old_cpus[i].freqs); + } + free(new_cpus); + free(old_cpus); + + return 0; +} + +/* + * Get the number of CPUs of the system. + * + * Uses the two files /sys/devices/system/cpu/present and + * /sys/devices/system/cpu/online to determine the number of CPUs. Expects the + * format of both files to be either 0 or 0-N where N+1 is the number of CPUs. + * + * Exits if the present CPUs is not equal to the online CPUs + */ +static int get_cpu_count() { + int cpu_count = get_cpu_count_from_file("/sys/devices/system/cpu/present"); + if (cpu_count != get_cpu_count_from_file("/sys/devices/system/cpu/online")) { + die("present cpus != online cpus\n"); + } + return cpu_count; +} + +/* + * Get the number of CPUs from a given filename. + */ +static int get_cpu_count_from_file(char *filename) { + FILE *file; + char line[MAX_BUF_SIZE]; + int cpu_count; + + file = fopen(filename, "r"); + if (!file) die("Could not open %s\n", filename); + if (!fgets(line, MAX_BUF_SIZE, file)) die("Could not get %s contents\n", filename); + fclose(file); + + if (strcmp(line, "0\n") == 0) { + return 1; + } + + if (1 == sscanf(line, "0-%d\n", &cpu_count)) { + return cpu_count + 1; + } + + die("Unexpected input in file %s (%s).\n", filename, line); + return -1; +} + +/* + * Get the number of frequency states a given CPU can be scaled to. + */ +static int get_freq_scales_count(int cpu) { + FILE *file; + char filename[MAX_BUF_SIZE]; + long unsigned freq; + int count = 0; + + sprintf(filename, "/sys/devices/system/cpu/cpu%d/cpufreq/stats/time_in_state", cpu); + file = fopen(filename, "r"); + if (!file) die("Could not open %s\n", filename); + do { + freq = 0; + fscanf(file, "%lu %*d\n", &freq); + if (freq) count++; + } while(freq); + fclose(file); + + return count; +} + +/* + * Read the CPU and frequency stats for all cpus. + */ +static void read_stats() { + FILE *file; + char scanline[MAX_BUF_SIZE]; + int i; + + file = fopen("/proc/stat", "r"); + if (!file) die("Could not open /proc/stat.\n"); + fscanf(file, "cpu %lu %lu %lu %lu %lu %lu %lu %*d %*d %*d\n", + &new_total_cpu.utime, &new_total_cpu.ntime, &new_total_cpu.stime, &new_total_cpu.itime, + &new_total_cpu.iowtime, &new_total_cpu.irqtime, &new_total_cpu.sirqtime); + if (aggregate_freq_stats) { + for (i = 0; i < new_total_cpu.freq_count; i++) { + new_total_cpu.freqs[i].time = 0; + } + } + + for (i = 0; i < cpu_count; i++) { + sprintf(scanline, "cpu%d %%lu %%lu %%lu %%lu %%lu %%lu %%lu %%*d %%*d %%*d\n", i); + fscanf(file, scanline, &new_cpus[i].utime, &new_cpus[i].ntime, &new_cpus[i].stime, + &new_cpus[i].itime, &new_cpus[i].iowtime, &new_cpus[i].irqtime, + &new_cpus[i].sirqtime); + read_freq_stats(i); + } + fclose(file); +} + +/* + * Read the frequency stats for a given cpu. + */ +static void read_freq_stats(int cpu) { + FILE *file; + char filename[MAX_BUF_SIZE]; + int i; + + sprintf(filename, "/sys/devices/system/cpu/cpu%d/cpufreq/stats/time_in_state", cpu); + file = fopen(filename, "r"); + if (!file) die("Could not open %s\n", filename); + for (i = 0; i < new_cpus[cpu].freq_count; i++) { + fscanf(file, "%u %lu\n", &new_cpus[cpu].freqs[i].freq, + &new_cpus[cpu].freqs[i].time); + if (aggregate_freq_stats) { + new_total_cpu.freqs[i].freq = new_cpus[cpu].freqs[i].freq; + new_total_cpu.freqs[i].time += new_cpus[cpu].freqs[i].time; + } + } + fclose(file); +} + +/* + * Get the sum of the cpu time from all categories. + */ +static long unsigned get_cpu_total_time(struct cpu_info *cpu) { + return (cpu->utime + cpu->ntime + cpu->stime + cpu->itime + cpu->iowtime + cpu->irqtime + + cpu->sirqtime); +} + +/* + * Print the stats for all CPUs. + */ +static void print_stats() { + char label[8]; + int i, j; + char print_freq; + + print_freq = should_print_freq_stats(); + + print_cpu_stats("Total", &new_total_cpu, &old_total_cpu, 1); + for (i = 0; i < cpu_count; i++) { + sprintf(label, "cpu%d", i); + print_cpu_stats(label, &new_cpus[i], &old_cpus[i], print_freq); + } + printf("\n"); +} + +/* + * Print the stats for a single CPU. + */ +static void print_cpu_stats(char *label, struct cpu_info *new_cpu, struct cpu_info *old_cpu, + char print_freq) { + long int total_delta_time; + + if (!minimal) { + total_delta_time = get_cpu_total_time(new_cpu) - get_cpu_total_time(old_cpu); + printf("%s: User %ld + Nice %ld + Sys %ld + Idle %ld + IOW %ld + IRQ %ld + SIRQ %ld = " + "%ld\n", label, + new_cpu->utime - old_cpu->utime, + new_cpu->ntime - old_cpu->ntime, + new_cpu->stime - old_cpu->stime, + new_cpu->itime - old_cpu->itime, + new_cpu->iowtime - old_cpu->iowtime, + new_cpu->irqtime - old_cpu->irqtime, + new_cpu->sirqtime - old_cpu->sirqtime, + total_delta_time); + if (print_freq) { + print_freq_stats(new_cpu, old_cpu); + } + } else { + printf("%s,%ld,%ld,%ld,%ld,%ld,%ld,%ld", label, + new_cpu->utime - old_cpu->utime, + new_cpu->ntime - old_cpu->ntime, + new_cpu->stime - old_cpu->stime, + new_cpu->itime - old_cpu->itime, + new_cpu->iowtime - old_cpu->iowtime, + new_cpu->irqtime - old_cpu->irqtime, + new_cpu->sirqtime - old_cpu->sirqtime); + print_freq_stats(new_cpu, old_cpu); + printf("\n"); + } +} + +/* + * Print the CPU stats for a single CPU. + */ +static void print_freq_stats(struct cpu_info *new_cpu, struct cpu_info *old_cpu) { + long int delta_time, total_delta_time; + int i; + + if (new_cpu->freq_count > 0) { + if (!minimal) { + total_delta_time = 0; + printf(" "); + for (i = 0; i < new_cpu->freq_count; i++) { + delta_time = new_cpu->freqs[i].time - old_cpu->freqs[i].time; + total_delta_time += delta_time; + printf("%ukHz %ld", new_cpu->freqs[i].freq, delta_time); + if (i + 1 != new_cpu->freq_count) { + printf(" + \n "); + } else { + printf(" = "); + } + } + printf("%ld\n", total_delta_time); + } else { + for (i = 0; i < new_cpu->freq_count; i++) { + printf(",%u,%ld", new_cpu->freqs[i].freq, + new_cpu->freqs[i].time - old_cpu->freqs[i].time); + } + } + } +} + +/* + * Determine if frequency stats should be printed. + * + * If the frequency stats are different between CPUs, the stats should be + * printed for each CPU, else only the aggregate frequency stats should be + * printed. + */ +static char should_print_freq_stats() { + int i, j; + + for (i = 1; i < cpu_count; i++) { + for (j = 0; j < new_cpus[i].freq_count; j++) { + if (new_cpus[i].freqs[j].time - old_cpus[i].freqs[j].time != + new_cpus[0].freqs[j].time - old_cpus[0].freqs[j].time) { + return 1; + } + } + } + return 0; +} + +/* + * Determine if the frequency stats should be aggregated. + * + * Only aggregate the frequency stats in the total cpu stats if the frequencies + * reported by all CPUs are identical. Must be called after read_stats() has + * been called once. + */ +static char should_aggregate_freq_stats() { + int i, j; + + for (i = 1; i < cpu_count; i++) { + if (new_cpus[i].freq_count != new_cpus[0].freq_count) { + return 0; + } + for (j = 0; j < new_cpus[i].freq_count; j++) { + if (new_cpus[i].freqs[j].freq != new_cpus[0].freqs[j].freq) { + return 0; + } + } + } + + return 1; +} + +/* + * Print the usage message. + */ +static void usage(char *cmd) { + fprintf(stderr, "Usage %s [ -n iterations ] [ -d delay ] [ -c cpu ] [ -m ] [ -h ]\n" + " -n num Updates to show before exiting.\n" + " -d num Seconds to wait between updates.\n" + " -m Display minimal output.\n" + " -h Display this help screen.\n", + cmd); +} -- cgit v1.2.3